add: payment transaction processor images to payment recommendations

[rjchow]

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Changes proposed in this Pull Request:

Context: 165-gh-woocommerce/team-ghidorah

We'd like to be able to display images for the payment recommendations for each payment method provider.

At this point in time the images hasn't been finalised yet so the included images for PayPal are a temporary placeholder. Before merging we should remove the mapping from DefaultPaymentGateways.php, and implement the finalised set only in wccom's remote API.

How to test the changes in this Pull Request:

• Have you followed the Writing high-quality testing instructions guide?

1. Go through OBW, and then turn off Marketplace Suggestions settings in WooCommerce Settings > Advanced Settings
2. Go to Payments task http://localhost:8888/wp-admin/admin.php?page=wc-admin&task=payments
3. If Remove accordion from "Other payment providers" in WC Pay Task #37205 hasn't been merged yet you will need to click on "Other payment providers" to see the payment methods
4. Observe that the images render as defined in DefaultPaymentGateways.php

Other information:

• Have you added an explanation of what your changes do and why you'd like us to include them?
• Have you written new tests for your changes, as applicable?
• Have you created a changelog file for each project being changed, ie pnpm --filter=<project> changelog add?
• Have you included testing instructions?

FOR PR REVIEWER ONLY:

• I have reviewed that everything is sanitized/escaped appropriately for any SQL or XSS injection possibilities. I made sure Linting is not ignored or disabled.

[codecov]

Codecov Report

Merging #37230 (d18fa6e) into trunk (0cf5677) will decrease coverage by 0.0%.
The diff coverage is 32.0%.

❗ Current head d18fa6e differs from pull request most recent head 5a947a2. Consider uploading reports for the commit 5a947a2 to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             trunk   #37230     +/-   ##
==========================================
- Coverage     46.7%    46.7%   -0.0%     
  Complexity   17191    17191             
==========================================
  Files          429      429             
  Lines        64845    64865     +20     
==========================================
+ Hits         30275    30282      +7     
- Misses       34570    34583     +13     

Impacted Files	Coverage Δ
...ugins/woocommerce/includes/class-wc-post-types.php	2.7% <0.0%> (-0.1%)	⬇️
...gins/woocommerce/includes/wc-product-functions.php	44.7% <100.0%> (+1.0%)	⬆️

[github-actions]

Test Results Summary

Commit SHA: 5a947a2

Test 🧪	Passed ✅	Failed 🚨	Broken 🚧	Skipped ⏭️	Unknown ❔	Total 📊	Duration ⏱️
API Tests	259	0	0	2	0	261	0m 47s
E2E Tests	191	0	0	10	0	201	17m 55s

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To view the full API test report, click here.
To view the full E2E test report, click here.
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[chihsuan]

LGTM and tested well. 👍

[adrianduffell]

LGTM, nice work on this @rjchow ! 🚀